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Segment Information - Reconciliation of Assets from Segment to Consolidated (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]    
Total assets $ 5,665.0 $ 3,828.7
Operating segments | U.S. Media    
Segment Reporting Information [Line Items]    
Total assets 4,937.7 3,610.0
Operating segments | Other    
Segment Reporting Information [Line Items]    
Total assets 291.1 202.5
Corporate    
Segment Reporting Information [Line Items]    
Total assets $ 436.2 $ 16.2